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How To Disable IPV6 in Ubuntu

By depratama
I want to  disable ipv6 in my Ubuntu Server.
First, I open /etc/sysctl.conf using  text editor.
$ sudo nano /etc/sysctl.conf
Then I  insert these following lines at the end.
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
After that, I save the file using Ctrl+O and exit from text editor using Ctrl+X. On terminal, I type this command 
$ sudo sysctl -p
I get result in terminal as,
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
After that when I check,
$ cat /proc/sys/net/ipv6/conf/all/disable_ipv6
I get result as,
1
From the result, I know my ipv6 disabled successfully.
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